Hydraulic press.



2 SHEETS-SHEET 1.

PATENTED JULY 23, 1907.

A- SGHWIEGEIL- HYDRAULIC PRESS.

APPLIOATION FILED JAN.29,1904.

No. 861,194. PATENTED JULY 23, 1907.

A. SGHWIEGER. HYDRAULIC PRESS.

APPLICATION FILED JAN.Z9,1904. v

2 SHEETS-$32M 2.

in 21 1 I 1.. I. H t IQV 7 C ARNOLD SGHWIEGER, OF OBERSOHCNEWEIDE. NEAR BERLIN, GERMANY.

HYDRAULIC PRESS.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed January 29,1904. Serial No. 191,219-

To all whom it may concern:

Be it known thatl, ARNOLD Scnwmenn, a subject of the German Emperor, and a resident of Oberschoneweide, near Berlin, Germany, have invented certain new and useful Improvements in Hydraulic Presses, of which the following is a specification.

The present invention relates to an improved hydraulic press adapted for the manufacture of tubes or profiled bars, the manufacture being effected by pressure on a metal block. In my improved press, I employ a mandrel for perforating the metal block, which mandrel also serves as core for the tube to be produced, and an object of the invention is to so construct and arrange the mandrel that it can be driven by a driving apparatus independent of'the driving piston for the plunger; that its stroke can be adjusted, and that its front part which is most subject to Wear can be removed and a fresh piece inserted in lieu thereof.

.Another object'of the invention is to so construct the press that it can alsobe used for rearward pressing simply by fixing the mandrel in the matrix-housing,

' in which case the product is ejected rearwardly by the pressure cylinder on an enlarged scale and showing two different steps of the operation.

7 is the main driving cylinder for the main" driving 7 piston 8. By means of rods 10 the cylinder 7 is connected with a cross-head 9 on which is mounted a pressure cylinder 11 which serves to receive the metal block which is to be formed into atube or a profiled bar. "The pressure medium for the driving cylinder 7 is introduced to and passes out from the cylinder through pipes 12 which are provided with a suitable controlling means. The plunger 14, which preferably is provided with a removable disk 15, is mounted on the front part of the piston 8 which is hollow and which, by means of a cross-piece 13 is guided by the rods 10. Thematrix 16 is mounted in ahousing 17 which can be secured in position by a slide 18 driven by a hydraulic driving apparatus 19. k

In the embodiment shown in Figs. 1 to 3 a supplemental driving cylinder 20 is arranged behind the main driving cylinder 7. The cylinder 20 is provided with a sliding piston 21 having the rear part of its piston rod 22 projecting outside of the rear head 29 of the cylinder 20 and provided with screw-threads with which engage two nuts 23 for adjusting the stroke of the'piston The front part of the piston rod 22 projects through a guide 25 which is secured in the head 24 of the main cylinder 7 and projects into the hollow piston 8. The mandrel 26 is detachably connected to the front end of the piston rod 22 and is guided in the plunger 14. The pressure medium is introduced to and passes out from the cylinder 20 through pipes 27 which are provided with suitable controlling means.

The mode of operation ofthe press is as follows: Let it be assumed that the pistons 21 and 8 are in their extreme positions to the right in which case the plunger 14 and the mandrel 26 are withdrawn from the pressure cylinder 11. A metal block 28is then inserted in the pressure cylinder 11 in the customary manner and pressure medium is introduced into the cylinder 20 to cause the piston 21 to move to the left thereby forcing the mandrel 28 into the metal block to perforate the same. The forward movement of the piston 21 with the mandrel 26 is continued until the front end of the mandrel projects into the opening of the matrix 16. In this position of the mandrel the nuts 23 abut against the head 29 of the cylinder thereby preventing further forward movement of the mandrel. Pressure medium is then introduced to the right side of the piston 8 in the main cylinder 7 and the piston with the plunger 14 is one having an opening corresponding to the profile'of the bar. Furthermore, the mandrel 26 with the piston 21 is moved all the way to the right and the pressing disk 15 is replaced by an imperforate disk. If then a solid block is inserted in the pressure cylinder 11 and the main piston 8 with the plunger 14 is set in motion,

the desired profile bar emerges from the matrix opening. When the mandrel becomes worn out it is drawn out therefor.

If it is desired to use the press for rearward pressing the cylinder 20, the piston 21, the piston rod 22 and the mandrel 26 are removed and a mandrel 31 ('Fig. 4) is inserted in the cross-head!) in lieu of the matrix 16 and its housing 17, and the front end of the plunger- 14 is provided with a matrix 32. The metal block 28, which must be previously perforated, is then inserted in the pressure cylinder 11 and the piston 8 and plunger 14 are set in motion so as to cause the metal to pass through the opening of the matrix 32 and move towards the right thr'ough the bore of the plunger and piston. If a profiled bar is to be produced by rearward pressing;- the mandrel 31 is removed and the cross-head is closed by a solid plate. It will be seen that the action of the press remains in the main the same when rearward pressing is employed.

Having described my invention, what I claim as new is: I

' 1. In a hydraulic press, the combination with the plunger and its driving piston, of a supplemental piston having a piston rod projecting to both sides thereof, a mandrel connected to one end of the piston rod, and means on the other end of the piston rod for adjusting the stroke of the supplemental piston. v

2. In a hydraulic press, the combination with the hollow plunger, the inain, ci'linder and -the hollow muin piston for driving the plunger", 01in supplemental cylinder, at piston operating in the supplemental cylindernnd hating a;

piston rod projecting through both ends of the supple mental cylinder, a mandrel projecting through the hollow main piston and plunger and detnchahly connected to 0118' end of said piston rod for adjustingfihe stroke of the supplemental piston.

In witness whereof I have signed this specification in the presence of two witnesses.

, ARNOLD SCIIWIEGER.

Witnesses: I

'uLDEilAli ILirrr'r. III-:xlzi' lhsrnu. 

